GRE閱讀短文練習

　　 Each of two particular inspection systems that are based on different principles would detect all product flaws but would also erroneously reject three percent of flawless products.Assuming there is no overlap between the products erroneously rejected by the two systems and also no interference between the systems if both operate, using both systems and rejecting only those products found flawed by both would be a way of avoiding all erroneous rejections.

　　Which of the following most precisely characterizes the reasoning in the argument?

　　The reasoning is conclusive, that is, the conclusion cannot be false if the statements offered in its support are true.

　　The reasoning is strong but not conclusive, if the statements offered in support of the conclusion are true, they provide good grounds for that conclu-sion, though it is possible that additional infor-mation might weaken the argument.

　　The reasoning is weak; the statements offered in support of the conclusion, though relevant to it, by themselves provide at best inadequate grounds for the conclusion.

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